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Model A1419 / EMC 2806 / Late 2014 or Mid 2015. 3.3 or 3.5 GHz Core i5 or 4.0 GHz Core i7 (ID iMac15,1); EMC 2834 late 2015 / 3.3 or 3.5 GHz Core i5 or 4.0 GHz Core i7 (iMac17,1) All with Retina 5K displays

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Prohibition Sign on Start Up

iMac won't start up and it shows the "Prohibition Sign" on start up. I went into recovery mode and to disk utility and it doesn't show my fusion drive and it shows no information what so ever. Can anyone help me?

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You won't see the Fusion Drive under Disk First Aid, You'll see the discreet drives (HDD & SSD) that combined make up the Fusion Drive set. If you can't mount the drives then you have a deeper problem!

At this point you'll need to use the command line interface of Core Storage following this guide: Fixing a Mac Fusion Drive that Disk Utility can’t erase

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Sounds like your fusion drive has failed.

Try to get ahold of another mac and make a bootable thumb drive for any OS X installer. See if your iMac will boot from this thumb drive. This would verify if your disk has failed or not.

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